Platen-shift mechanism for type-writing machines.



PLATENSHIFT MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED SEPT,10.1904'I PATENTED JULY 24, 1906. J. 12.550012.

5 SHEETS-SEEM 1.

43620 wi bypcooao I {/7 5 wue l 1 1 02 No. 826,892. PATBNTBDJULYZIL1906.

J. B. :SEGOR. I I PLATEN SHIFT MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED SEPT.10.1904.

5 SHEETS-SHEET 2.

ammwutoz PATENTEQ JULY. 24, 1906. J. B. SEGOR. PLATEN SHIFT MECHANISMFOR TYPE WRITING MACHINES.

' -ALPILILQTION FILQD BBPT.10.1904.

/ 5 SHEETS-SHEET 3.

No. 826,892. PATENTED JULY 24, 1906.

PLATEN SHIFT MECHANISM FOR TYPE WRITING MACHINES. APPLICATION PIL'EDSEPT. 10. 1904. I

5 s32ET-sHEET 4.

ww w I P mm 0 T B 8 mm d SHIFT MECHANISM FOR TYPE WRITING MACHINES.-

APPLIOATION FILED SEPT. 10. 1904.

5 SHEETS-SHEET 5.

wi kueooec JEROM B. SECUR,

ATIUNO ammo. July 24:, 1906.

filed Septemb c b),

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l I J Mech 211115111 for 'I ,Which he foils $113 0s 10 provlcie certain.1.

parts to i 20 ca'z'm M L H ml 4 Q T m. G. 1 .ru i ,U H,

unison by abar 22. 20 represents forked lmks straddling the sublevers 18and pivoted to the shift-levers 20. Links 20 are adapted to bear duringoperation at two different 1 points on suble'vers 18, so that there willbe first a greater leverage exerted on levers 18- projection 24, seatedin a portion of the ends of the linkg 7. ances the weight of the platen5- and the ame 1 of the machine. 25 is an antifriction-roller pivoted ona stud 26, seated in the swm mg frame and a keeper-plate 27, se-

cure .to; the frame 15, which plate 27 is provided with a lug orprojection 27, bent to engage the under side of a track fiange' 16 onthe shifting-frame 16.

Antifriction-roller 25 travels on track-flange 16*. 28 is a lug orprojection on the swinging frame 15, engag mg, the opposite side of theshifting-frame 16 from that engaged by the lug orprojeetion 27. Lugs orprojections 27 and 2.8 prevent automatic disconnection between theswingmg frame 15 and the shifting-frame 16 during course of travel ofthe carriage upon the machine-frame.

The operation of the mechanism thus far described is as follows; Thedepression of either one of the shift-levers will depress the other,draw down the straddling links 20*,

the forward ends of the sublevers 18 elevatmg their rear ends forcingthe shifting-frame 16 upwardly untif stopped by stops or pro ections 24engaging stops or projections 23',

and forcing swinging frame 15, links 7, vertical llIlkS 12, and theplaten 5 up until the platen is sto ed by an ena ement ofthe shaft 10 ofsa d %1 g I platen with t e upper ends of the slots 13; In thetwopositions occu i ed b the platen the shaft 10 occupies a p anea ove anda plane below, respectively, equidistant from the plane of the rear bar8.

order to reduce friction between the sh fting-frame 16 and the swingingframe 15 and ease-the touch of the shift-levers 20, I have provided aband-spring 7 secured to the frame of the carriage and to the platenSpring 7 counterbalparts lifted therewith, and hence it takes weight.off of frames 15 and 16, thereby g'reatl reducin the friction betweenframe 16 an the anti 'iction-roller 25, and thus reducing the weight tobe overcome by the fingerm shiftin the case. Connected to either or bothof en levers 18 is a spring18 connected at its other end to a portion ofthe machine-frame l and resisting the raising of the rear end ofsublever 18.

Springs 7 and 18 may be so tensioned that the normal position of theplaten will be such that the antifriction-rollers will bear but lightlyupon the frame 16, so that friction between said rollers and frame willbe seeeee platen-carriage and bent at its lower end to.

engage the groove. 39 in the track-bar 40, Fig. 1. Keeper-plate 38 willprevent vertical displacement of the carriage upon depression of eitherof the shift-levers 20.

Referring now to the shift-lever-locking mechanism, (shown in Figs. 1,7,8, and 9,) 51 represents an auxiliary shift -\key slidably mounted ina bracket 52, mounted on the machine-frame 1, the shank of saidshift-key being cut away to form a shoulder 51*, adapted to en a e akeeper 55, secured to the side of the s it-lever 20' and bent under saidshift-lever 20 into the path of reciprocation of the key 51. Positionedbeneath the key 51 is a trigger 56, mounted on a pivot-bar 57, journaledin the machine-frame and held normally in upright position by a spring58 engaging the lower or short'arm of said trigger 56. The head of thetrigger 56 is in the same vertical plane with the eeper 55, while,

the short arm of the trigger 56 is in the same.) I

vertical plane with thenarrow portion of the lower end of the shank ofthe key 51.

In operation upon depression of the shiftlock key the shoulder 51 on theshank of said key 51 engages the trigger-keeper 55., which being rigidlymounted upon the shift-lever 20 carries said lever 20 to its shiftedposition. In the meantime the lower end of the shank of the key 51continuing downwardly engages I the short frame of the trigger'56 and bypressing on the short arm of said trigger throwing the head of thetrigger 56 forward until the same is in line of engagement with keeper55. Shift-lock key 5.1 is then released, allowing the lever 20 to ascenduntil it engages the head of the trigger 56. The tendency of the springengaging the short arm of the trigger 56 being to force the head of saidtrigger away from keeper 55, the head of the trigger 56 is held inengagement with keeper' 55 ,solely by friction. The trigger 56 isreleased from its locking engagement through means of a subsequent deression of a shift-lever 20 by the main shift ey 20". Such depressiondisengages the head of thetrigger 56 from keeper 55 long enough to allowthe spring engaging the short arm of the trigger 56 to throw the saidtrigger'backward out of the path of the keeper 55. The shift-look devicejust desoribed is illustrated in connec tion witha front-striketype-writing machine; but it will be obvious that the same may beapplied to any form of machine.

in Figs. and 11 I have illustrated slight l of disks shown but onelink-32, Fig. 10j but there are two of'said links, one mounted on eachside of the machine-frame. Links 32 are substituted in this constructionfor the grooves or notches 17, Fig. 3, and serve to limit theshifting-frame 30 to a substantially vertical movement. At its lower endthe shifting frame 30 is pivotally connected, through means of lugs 35,to studs 36, seated in sublevers 31, mounted on pivots 31. Sublevers 31are connected. to shift-levers through means of links37. Shifting-frameis constructedin other respects than those stated similarly toshiftinggtra ne 16 and is connected to swingin rame, 15 in the samemanner as shittingame 1.6 is connected thereto. The operations of thisform of platen shift'mechanism is identical with theoperation of thatalready described, and hence.

needs no further description.

Referring now to the form of shift mechanism shown in Figs. 12 and 13, Ihave shown a platen-shifting mechanism which operates reversely to thetwo forms of platenshift mechanism heretofore described--that is,therein the platen is normally. in its elevated position and isdepressed to shift the same to its capital or upper-case position. Inthis mechanism which employs the two shift-levers 20, connected by thebar 22 and pivoted to a pivot-bar 41, journaled in the 1nachine-frame 1and extending transverse the machine, Fig. 12, the shift-levers 20 areconnected directly to a shifting-frame coinprhsihg the pivot-bar 43,pivotally mounted in the machine-frame l, and a lrack har 42, bars 3'2and 43 being connected by braces 44. The corn necti-on hetwecnshi" VGYS26 an l the platen shifting frame in this instance consists inadjustable huckle rods 4.4 in a swinging frame pivoted to studs .l-i onlinks 7 in like manner to swinging frame 15. extended down to thehorizontal plane of track-bar 42 to which it is connected oylugs orprojections 46 and along which it slides. 47' represents pivotedantiiric tion-latches, one at each end. of the platen, pivoted tostuds48, seated in. the end plates 9 of the carriage and carrying at.their upper ends antifriction-rollers 49, which bear against disks50,'n;ounted on the platen-shaft l0. Latches 47 are connected by springs51 to end plates 9. The a1itifriction-rollers 49 are so positioned onlatches 47 as to bear against the upper sides Frame iswhen the platen isin its depressed position and to bear against the lower surface,

of said disk when the platen is in its normal or elevated position.Springs 51 draw latch 47 toward shaft 10 and hold roller 49 in con tactwith the surface of the (1181450. In operationeithenone of theshiftdevers 20 are depressed, drawing down the buckle-rods 44,depressing the platen-shiltin g frame 42 43 v44, drawing down theswinging frame 45 and platen 5. The latches 47 hold the platen 5 in itsdepressed or shifted position, and thereby relieve the frame 45 and bar42 lrom friction. They likewise hold platen: 5 in elevated position, andthereby again relieve the parts from friction when the platen istraveling in its normal position. Upon depression of a shiftdever 20,the platen 5 being drawn down, antitriction rcller 49 passes over thesurface of the disk 50 to the upper surface thereof in opposition tospring 51, the roller 49 being re turned to its normal position by thejar of the parts incident to the release of the shift levers 20, theresistance of springs 51 is over come by the hand of the operator-,andupon release of said lever the same is overcome by the impetus in theascent of frame 45. Previous to eitherof said movements latch 47 is neffective position. Latches 47 perform suhstantiallythe same functionthat spring 7 F in Fig. 4 performs-that is, they balance the weight ofthe platen and the parts that have to he lifted therewith, thus reducing.the weight to be o ercome by the finger in shifting the case, andthereby making the touch light. The combination of spring 22 withlatches 47 gives alight and smart action to the shift.

' If desired, the several forms of connection between the swingingframes and shifting-fra1nes may be transposed-such, for instance, as theuse of the form of connection shown in Fig. 6 on the structure sl own inFigs. 12 and 13, and vice vcrsa.

Having thus described my invention, what i claim as new therein, anddesire to secure by Letters Patent,

1. In a platmtshift mechanism for writingmachines, the coinhinetitm witha machineirarne and the carriage mounted to travel thereon, of ashiitable platen, a movable frame for slli'ftin g said pla =n, means forguiding said frame in its movement, means or moving said frame, aswinging Frame suitahl' I connected to. theplaton, and a suitableantiiriction interlocking connection between said shifting and swin rinsframes.

2. in a platen-shirt mechanism for writing-- machines the combinationwitha machineframe and a platen-carriage mounted to travel upon saidframe, of parallel pairs of links piv otally mounted on said carriage, aplaten mounted on one of said pairs of links, a frame swinging fromthe'other of said pairs of links,

means for connecting the pairs of links to in?

